Pipe interruption fitting

Abstract

A pipe interruption fitting having a flange is removable after pipe maintenance work has been completed. The fitting includes an upper reinforcing plate, an inner surface of which has a curvature corresponding to an outer surface of the pipe, and a vertical pipe welded to the upper reinforcing plate. The fitting further includes an adaptor welded to the vertical pipe. Bolt holes are formed in an upper surface of the adaptor. A through hole is formed through the adaptor. An annular groove is formed in an inner surface of the through hole. The flange is removably coupled to the adaptor. Coupling holes are formed in the flange for installation of a boring machine or a stopple machine. The fitting further includes a plug fitted into the through hole of the adaptor and having an expansion plate to be inserted into the annular groove. A cover is adapted to be inserted into the through hole of the adaptor and to be welded thereto.

1. A pipe interruption fitting used for interrupting fluid flow in a pipe for conducting pipe maintenance work, comprising:
 an upper reinforcing plate having a circumferential inner surface with a curvature adapted to a curvature of a circumferential outer surface of the pipe; 
 a short vertical pipe welded to said upper reinforcing plate; 
 an adaptor welded to an end of said vertical pipe remote from said upper reinforcing plate and including an outer side surface having an inclined surface at a position closer to said vertical pipe and having a vertical surface at a position remote from said vertical pipe, wherein said adaptor has a plurality of bolt holes formed in an upper surface thereof remote from said vertical pipe, a through hole having an inner diameter equal to an inner diameter of said vertical pipe, and an annular groove formed in an inner surface of said through hole; 
 a flange removably coupled to the upper surface of said adaptor by bolts fastened into said bolt holes of said adaptor, wherein a plurality of coupling holes are formed in said flange so that a boring machine or a stopple machine can be coupled to said flange; 
 a plug adapted to be seated in said through hole of said adaptor and including an expansion plate adapted to be inserted into said annular groove of said through hole of said adaptor, and 
 a cover adapted to be inserted into said through hole of said adaptor onto an end of said plug remote from said upper reinforcing plate, wherein said cover is adapted to be welded to said adaptor. 
 
     
     
       2. The pipe interruption fitting according to  claim 1 , wherein said plug comprises:
 an expansion plate having a circular shape, wherein said expansion plate is separable into two bodies and is provided with a central hole formed at a medial position of a cutting line through said expansion plate, wherein said central hole is relatively short in a direction in which said expansion plate is adapted to be expanded and is relatively long in a direction perpendicular to the direction in which said expansion plate is adapted to be expanded, wherein a plurality of slots are formed in said expansion plate at symmetrical positions with respect to the cutting line, and wherein pins are provided on said expansion plate at symmetrical positions with respect to the cutting line; and 
 a cylindrical body coupled to said expansion plate, wherein a plurality of threaded holes are formed in an upper surface of said cylindrical body at positions corresponding to said slots of said expansion plate, wherein said expansion plate is coupled to said cylindrical body using bolts fastened into said threaded holes through said slots of said expansion plate, wherein an O-ring is inserted into an annular groove formed in a circumferential outer surface of said cylindrical body, wherein a circular hole is vertically formed at a central position through said cylindrical body, and wherein a check valve is provided in the circular hole of said cylindrical body.